US 12,236,984 B2
Perpendicular magnetic recording writer with tunable pole side bridge design
Yue Liu, Fremont, CA (US); Moris Musa Dovek, San Jose, CA (US); and Yan Wu, Cupertino, CA (US)
Assigned to Headway Technologies, Inc., Milpitas, CA (US)
Filed by Headway Technologies, Inc., Milpitas, CA (US)
Filed on Oct. 24, 2022, as Appl. No. 17/972,514.
Prior Publication US 2024/0135965 A1, Apr. 25, 2024
Prior Publication US 2024/0233758 A9, Jul. 11, 2024
Int. Cl. G11B 5/127 (2006.01); G11B 5/23 (2006.01); G11B 5/235 (2006.01); G11B 5/31 (2006.01)
CPC G11B 5/1278 (2013.01) [G11B 5/23 (2013.01); G11B 5/235 (2013.01); G11B 5/3133 (2013.01); G11B 5/3143 (2013.01); G11B 5/315 (2013.01); G11B 5/3163 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A perpendicular magnetic recording (PMR) write head comprising:
a main pole (MP) including a tip portion configured to be disposed at an air-bearing surface (ABS) and configured to interact with a magnetic recording medium;
a hot seed (HS) portion;
a first write shield connected to the HS portion and disposed at the ABS;
a first metallic side bridge disposed between the tip portion of the main pole and the HS portion;
an oxide layer comprising a metallic oxide element and disposed between the first metallic side bridge and the HS portion to electrically isolate the metallic side bridge and the HS portion, a thickness of the oxide layer being between 1-4 nanometers, and wherein the first metallic side bridge comprises a thickness together with the thickness of the oxide layer between 15 and 25 nm; and
a bias circuit including at least a first bias electrical pad and a second bias electrical pad, the bias circuit directing an electrical current flow along an electrical path between the tip portion of the main pole and the write shield via the first metallic side bridge.